Study on the Modification of Ala-CQDs/g-C3N4 and Its Photocatalytic Properties
AC/CN composite photocatalysts with different mass ratios were prepared by hydrothermal method using urea as precursor,glucose and citric acid as carbon source and L-alanine as nitrogen source.XRD,UV-Vis,FT-IR and fluorescence were used to characterize the crystal structure,light absorption properties,structure composition and optical properties of the composite photocatalyst,and the degradation rate of methylene blue was investigated under visible light.The experimental results show that the AC/CN composite photocatalyst has higher utilization rate of visible light and can effectively inhibit the carrier hole recombination efficiency compared with pure CN thus improving the photocatalytic activity.When the mass ratio of AC and g-C3N4 is 1∶3,the photocatalyst performance is the best.After visible light irradiation for 120 min,the total degradation rate of methylene blue by AC/CN composite photocatalyst reached 43%which was 1.96 times that of pure graphite carbon ni-tride photocatalytic effect.